Update Xamarin component packaging tool

The old version of the tool had a bug where references to DLLs in the sample projects would sometimes get rewritten incorrectly to match the structure of the .xam file. Namely, anytime that there was a binary that appeared in multiple places and had identical names and hashes (eg. a PCL), it would be a 50/50 chance that the wrong output lib/<framework>/ directory was chosen.